Shock absorber for drilling tool in oil-gas drilling

Abstract

The invention discloses a shock absorber for a drilling tool in oil-gas drilling. The shock absorber comprises a mandrel, wherein a spline and a fixed piston are arranged on the mandrel; a spline outer cylinder is arranged on the spline, and the spline outer cylinder and the spline form an axial sliding pair; a plurality of damping channels are axially formed between the spline and the spline outer cylinder; the lower end of the spline outer cylinder is connected with a lower outer cylinder, and the upper end of the spline outer cylinder is sequentially connected with an upper outer cylinder,an upper seal joint and an upper joint; the spline outer cylinder and the upper outer cylinder, the upper seal joint and the lower outer cylinder, the fixed piston respectively form an upper annular cavity and a lower annular cavity at the periphery of the mandrel, and the two cavities are communicated through the damping channels; an oil injection nozzle and a gas injection nozzle are respectively formed on the spline outer cylinder and the upper seal joint in the radial direction; the oil injection nozzle is communicated with the damping channels; the gas injection nozzle is communicated with the upper annular cavity through a gas injection annular channel; and a movable piston is arranged in the upper annular cavity. The shock absorber for the drilling tool in the oil-gas drilling integrates liquid, damping and gas shock absorption so as to avoid the fatigue failure of the drilling tool, and has the characteristics of high shock absorption performance, long service life, low manufacturing cost, simple structure, a few quick-wear parts, convenience of maintenance and the like.

Description

technical field [0001] The invention relates to an equipment protection device for oil and gas drilling engineering, in particular to a shock absorber for drilling tools, which is especially suitable for gas drilling tools. Background technique [0002] In the drilling engineering of oil and gas wells, the drill bit is used to break the hard bottom layer. During drilling, the drill bit does not work smoothly at the bottom of the well, which makes the drill string produce obvious longitudinal vibration, that is, the phenomenon of drill jumping. Drill jumping causes drill tool resonance, which has a considerable destructive effect on the drill bit, drill pipe and ground equipment, and has a huge impact on the stability of the well wall, which is a major safety hazard. [0003] At present, there are several kinds of drilling tool shock absorbers used in oil drilling engineering. Mechanical spring shock absorbers and hydraulic shock absorbers are commonly used. The range of sti...

AI Technical Summary

Problems solved by technology

Torsional vibration shock damping is realized by using the complementary structure of ring gap damping and composite combined disc spring, but its structure is relatively complicated and inconvenient to maintain, and its technical solution is also different from that of the present invention

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